1606068591 has 32 divisors (see below), whose sum is σ = 2308601088. Its totient is φ = 989514240.

The previous prime is 1606068577. The next prime is 1606068599. The reversal of 1606068591 is 1958606061.

It is a happy number.

It is not a de Polignac number, because 1606068591 - 2⁷ = 1606068463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606068599) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1513201 + ... + 1514261.

It is an arithmetic number, because the mean of its divisors is an integer number (72143784).

Almost surely, 2^1606068591 is an apocalyptic number.

1606068591 is a deficient number, since it is larger than the sum of its proper divisors (702532497).

1606068591 is a wasteful number, since it uses less digits than its factorization.

1606068591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 1606068591 is about 40075.7855942962. The cubic root of 1606068591 is about 1171.0839519919.

The spelling of 1606068591 in words is "one billion, six hundred six million, sixty-eight thousand, five hundred ninety-one".